Method of producing expansible collapsible elements



Jan. 8, 1929. 1,698,164

H. C. MALLORY METHOD OF PRODUCING EXPANSIBLE COLLAPSIBLE ELEMENTS Original Filed April 22, 1914 #29 r V Y.

3m QM QIMw 6mm4 1114 ATTORNEY Patented Jan. 8, 1929.

UNITED STATES PATENT oFFicE;

HARRY O. MALLOR'Y, DECEASED, LATE OF BELLPORT, NEV YORK,B'Y SUE R. MALLORY, ADMINISTRATRIX, OF BELLPORT, NEW YORK; SAID HARRY C, MALLORY ASSIGNOR, BY MESNEASSIG-NMENTS, TO AMERICAN RADIATOR COMPANY, OF CHICAGO, ILLI- NOIS, A CORPORATION OF NEW JERSEY.

METHOD OF PRODUGINGEXPANSIBLE OOLLAPSIBLE ELEMENTS;

Original application filed April 22, 1914, Serial No. 833,593. Renewed December 5, 1919, Serial No. 342,802. Divided and application filed August 31, 1920, Serial No. 407,212. Divided and. this application filed January 16, 1924. Serial No. 686,500.

The invention relates to improvements in methods for producing expansible-collapsiblc elements adapted'for use in connection with thermosensitive of pressure sensitive devices, and for other purposes, and the same has for its object to provide an element ofthe diaphragm type which, while readily responsive to slight temperature or pressure variations, is not. apt to fracture, or sub ect to other impairment as a result of use.

Further, said invention has for its ob ectto provide an elastic orfleXible element of the diaphragm type having a corrugated portion, the folds or bends of which are adapted to contact within the limit of the elasticity of the metal when the diaphragm or element is collapsed to its full extent.

Further, said invention has for its object to provide .an eXpansible-collapsible element of the diaphragm type which is conical n form and capableof extended movement in response'to pressure or temperature variationswithout liability of becoming fractured orv impaired as a result of repeated expansion and contraction.

Further, said invention has for its object to provide an expansible-collapsible element of conical form having its body portion circumferentially corrugated, and the inner and outer rounded end portions or bends of said corrugations connectedby alternately long and short lateral portions.

Further, said invention has for its object to provide a simple, convenient and practical method of producing an eXpansible-collap sible diaphragm of the character specified.

Other objects willinpart be obvious, and in' part be pointed out hereinafter.

o the attainment of the aforesaid objects and ends the invention consists in the several steps constituting the method hereinafter more'fully described, and then pointed out in the claims. I p,

, In the accompanying drawings forming part of this specification wherein likenumerals of reference indicate like parts; 7 Figure l is a face view showing a blank from which an expansible-collapsible element embodying the invention may be made;

Fig. 2 is a central sectional view thereof; Fig. 3 is a central sectional view showing by the diaphragm15 may the first step of the process in which the fiat v blank is rolled, pressed or spun in conical form;

Fig. 4 IS a similar View showing the blank as the same appears after it hasnbeen subjected to. the action of suitable dies and circumferentially corrugated to a certain extent; I

Fig. 5. is a similar View showing theblank w th the corrugations fully developed there- 1n, and provided at its open end with anannular flange or end;

Fig. 6 is an enlarged detail sectional View.

showing the construction and arrangement of the corrugations, and

Fig. 7 is a detail central sectional view showing an exp ansible collapsible diaphragm. embodying the invention applied to a damper reglator for steam or hot water boilers, etc.

In. producing an expansible-collapsible dlaphragm there is first produced from a sheet of metal a flat, circular disk lOhaving a thicker central portion 11 to form a rein forced closed end for the element. f The said disk 10 is thenrolledpressed or spun into wall of the corrugated portion in order to form a substantialconnecting portion wherebe conveniently. secured to a suitable support.

In: order to prevent the metalv of the diaphragm 15 being strained beyond its elastic limit at approximately the center of the annular connecting portions when the diaphragm is collapsed to its full extent, the corrugations 13are formed with rounded inner bends 13 and similar outer bends 13" and the ends of said outer bends 13?, connected to, or united with one end of each of theinner bends 13? next above and below said'outer bends '13" by-a wide annular member 14, and a narrow member 14*, respectively. r

At Fig. 7 is shown an expansible-collapsibl'e element of the diaphragm type as hereinabove described, incorporated in a damper regulator for boilers. In said construction the diaphragm has its open, larger end secured to a casing 16 at the junction of the two sections 17, 18 by means of an annular member or flat ring 19 which embraces the lowermost corrugation adjoining the flange 14, and is secured in said casing by bolts and nuts 21. i

In the interior of the closed, smaller on d of the diaphragm is secured a disk 22 which serves to rei'nior said smaller closed end which is adapted to engage with the head oi the stem 24 which extends through an opening in the upper end of the casing 16.

When the pressure in the boiler increases it will be communicated through the opening 26 in the base of the casing 16 to the interior of the diaphragm 15, and cause the same to C2-C- pand and in sodoing raise the stem 2-4, which i in turn will act upon the under side of a lever vided upon the top of thecasing 16,

27 pivotally supported in bearings 28 probe free end of the lever 27 may be suitably connected to the damper in order to control the operation thereof. p

The diaphragm 15 has its sides formed at such angle and the annular member 14, 14 of each corrugation formed of such length that the outer bends 13 and the inner bends 13 overlap, whereby when the diaphragm 15 1 is collapsed the upper sides of the under annu'lar' members 14 will contact with the lower or under sides of the outer bends 13 and the under sides of the under members 14 will contact with the inner, upper faces of the inner bends 13, and thereby form a stop and prevent the metal in the convolutions bending beyond the limit of its elasticity. This construction is particularly important in View of the fact that the corrugation having the greatest area, in this case shown at the bottom, is most flexible,-the flexibility decreasing in direct proportion as the area deer ases. The corrugation having the greatest area will consequently collapse first when the diaphragm is subjected to pressure from above,

and it is therefore necessary that each corru-' gation should be so formed as to make a stop within the limit of elasticity of the metal in order to prevent rupture of the diaphragm in said wider annular connecting members 14, 14.

This application is a division of an application Serial No. 407,212, filed August 31, 1920,

which in turn is a division of an earlier ap-.

plication, Serial No. 833,593, filed April 22, 1914, renewedDecember 5, 1919, Serial No. 342,802, and patented January 25, 1921, No. 1,366,473.

In this case no claim is made for the product, resulting from the method herein shown, described and claimed, as said product const-itutes the subject matter of'said application, Serial No. 407,212, which eventually resulted in Patent No. 1,484,141, dated February 19, 1924. V

Haring thus described said invention, what is claimed and desired to secure by Letters Patent is: t p

1. The method of making an expansiblecollapsible element which consists in forming from anietal blank a conical body portion, and rendering said body portion elasticby forming circumferential corrugations therein, having tlieir outer bends arranged in stepped formation, and each disposed in a horizontal plane inidway between the next adj int inner and outer bends, substantially a. BQClllQt. V V 2. The u'ietacd of making an cxpansiblecollapsible element which consistsin forming from a metal blank a conical body poition, and circumferentially corrugating said conical body portion to render the same clas tic, said corrugations each having the center of its outer bend disposed ina vertical plane coinciding with the center of the inner bend next below the same,substantially as specified. i

3. The method of making .an expansible collapsibleelement which consists in forming from a metal blank a conical body tic, and forming a tubular flange of greater ill] thicknessthan said corrugated portion integrally therewith and extending therefrom, substantially as specified.

4.. The method of making aneXpansibla' collapsible element which "consists in form ing a shell, and forming circumferential elastic corrugations therein with the inner and outer bends thereof united by alternately narrow and wide annular connecting portions,substantially asspecified. I

5. The method of making an expansible collapsible element which consists in form.- ing from a metal blank a conical body portion, and forming circumferential elastic corrugations therein with rounded inner and outer bends united by alternately narrow and wide annular connecting portionspand arranging the outer bends of said corrugations in stepped formation, substantially as specified.

6. The method of making an expansible= collapsible element which consists in form ing from a thin metal blank a conical body portion, forming a series of horizontal annu= lar portions therein arranged in stepped formati.onand a seriesof inclined annular portions uniting said horizontal portions, and drawing said portions towards each other and forming circumferentialcorrugations in said body portion to render the same elastic, substantially as specified.

7 The method of making an expansible collapsible element which consists in forming from a thin metal blank a conical body portion, forming a series of horizontal annular portions therein arranged in stepped formation and united by a series of narrower inclined annular portions, and drawing said horizontal annular portions towards each other by reversing the inclination of said narrower portions and forming a series of circumferential corrugations in said body portion to render the same elastic, substantially as specified.

8. The method of making an expansiblecollapsible element which consists in forming from a thin metal blank a conical body portion, and forming in said body portion circumferential elastic corrugations with the outer bend of one corrugation disposed directly over the inner bend of the corrugation next below, substantially as specified.

9. The method of making an expansiblecollapsible element which consists in forming from a thin metal blank a conical body portion, and forming in said conical body portion a series of circumferential elastic corrugations in stepped formation and with the alternate inner and outer bends thereof ifin superposed relation, substantially as speci- 10. The method of making an expansiblecollapsible element which consists in forum ing from a thin metal blank a conical body portion, forming a series of horizdntal annular portions therein arranged in stepped forcounty of New York, in the State of New York, this 15th day of January, one thousand nine hundred and twenty-four.

r son a. MALL ORY, Admin-istra tm'm of Estate of Harry 0. Mai- Zory, Deceased. 

